Purewell Variheat mk2 cast iron boiler
Purewell Variheat mk2 cast iron boiler cutaway

Available in 5 condensing models with outputs (@50/30°C) of 70, 95, 110, 140 and 180 kW.

Recently updated cast iron condensing, fully modulating, pre-mix gas fired commercial boiler.

Efficiency 96 product icon
Fuel NG product icon
Turndown 3 product icon
Warranty 10 heat exchanger product item
BIM objects icon
ErP Part L Compliant product icon

Product information

    • Proven reliability with a 10-year heat exchanger warranty
    • NEW built in boiler sequence controls capable of controlling up to 16 boiler modules and hot water circuits
    • Easy  access for servicing with NEW quick to remove front cover hooks 
    • NEW full spark ignitor enables servicing without the need to remove the whole burner
    • NEW Low NOx performance (<40mg/kWh, European Class 6)
    • Non complicated design means the Purewell Variheat mk2 is easy to operate & maintain, saving on time and money
    • Highly efficient offering up to 96% gross seasonal efficiency, reducing carbon emissions and saving the end user money on fuel bills
    • Fully factory tested before delivery
    • Sits on same footprint as many traditional and atmospheric cast iron boilers reducing space concerns
    • Easy access to plant room as the Purewell Variheat mk2 fits through a standard doorway
    • Can be disassembled for plant rooms with difficult access
    • Tolerant of existing heating systems making the Purewell Variheat mk2 the perfect choice when replacing old atmospheric boilers
    • Operates in sealed and open vented heating systems (you can read about the differences of Sealed 'v' Open Vented heating systems here)
    • Suitable for use with LPG Air for installation in the Channel Islands
    • Buy in confidence from a UK manufacturer with decades of commercial heating and hot water expertise
    • Extensive back up and support from our team of experience engineers across the UK
    • BIM objects available to assist in design and management
    • The only cast iron condensing commercial boiler that is compliant with the Energy related Products Directive (ErP) available in the UK.

Technical data

Units PV70c
Energy
Building regulations - seasonal efficiency (%) gross 95.3
ErP efficiency rating (modules ≤ 70 kW only) A
Boiler output (non-condensing) mean 70°C - max kW 63.5
Boiler output (non-condensing) mean 70°C - min kW 21.2
Boiler output (condensing) mean 40°C - max kW 70
Boiler output (condensing) mean 40°C - min kW 23.3
Gross boiler input - max kW 72.2
Gross boiler input - min kW 24.1
Net boiler input - max kW 65
Net boiler input - min kW 21.7
Water
Water content litres 8
System design flow rate @ 20°C ∆T rise l/s 0.8
Water side pressure loss @ 20°C ∆T rise mbar 32
System design flow rate @ 11°C ∆T rise l/s 1.5
Water side pressure loss @ 11°C ∆T rise mbar 96
Maximum water pressure bar g 6
Gas
Gas flow rate natural gas (G20) - max m3/hr 6.9
Nominal inlet pressure natural gas (G20) - max mbar 20
Maximum gas inlet pressure natural gas (G20) mbar 25
Flue
Flue Gas Flow Rate@ 15°C, 9.5% CO2 m3/hr 86
Approx. flue gas temperature @ 50/30°C °C 40
Approx. flue gas temperature @ 80/60°C °C 60
Pressure at boiler flue spigot @full load Pa 100
Dry NOx emission* mg/kWh 21.3
Connection
Water flow/return connections inches R2”
Gas inlet connection pipe thread size inches R1”
Nominal flue diameter (I/D) mm 150
Electrics
Electrical supply 230 V 1 Ph 50 Hz
Power consumption @ max W 94
IEC power outlet power consumption @ max W 460
Start current and run current Amp 0.54
Approx shipping weight kg 195
Noise emission @1 m and @maximum boiler modulation Max dB (A) 53
CO2 (±0.25%) - max % 9.5
CO2 (±0.25%) - min % 9.5
*0% excess oxygen, dry air free, European Class 6

Downloads

Purewell Variheat mk2 boiler brochure

Product brochures 3911 kb

AGU 2.550 Expansion Kit Wiring Instructions

Installers guides 2245 kb

LPB Expansion Kit Instructions

Installers guides 2358 kb

Purewell Variheat mk2 Installers Guide

Installers guides 10411 kb

Purewell Variheat mk2 pipework kits installation manual

Installers guides 2546 kb

QAA74 - Technical Manual

Installers guides 1640 kb

QAA74 Quick Reference Guide

Installers guides 178 kb

Purewell Variheat mk2 boiler hydraulic schemes

Hydraulic schematics 353 kb

Purewell Variheat mk2 boiler 2D layout for 2 boilers CAD

CAD 3271 kb

Purewell Variheat mk2 boiler 2D layout for 3 boilers CAD

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Purewell Variheat mk2 boiler 2D layout for 4 boilers CAD

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Purewell Variheat mk2 boiler 2x PV110 pipe kit F CAD

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Purewell Variheat mk2 boiler 2x PV110 pipe kit P CAD

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Purewell Variheat mk2 boiler 2x PV110 pipe kit R CAD

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Purewell Variheat mk2 boiler 2x PV110 pipe kit S CAD

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Purewell Variheat mk2 boiler 2x PV140 CAD pipe kit P

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Purewell Variheat mk2 boiler 2x PV140 pipe kit F CAD

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Purewell Variheat mk2 boiler 2x PV140 pipe kit R CAD

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Purewell Variheat mk2 boiler 2x PV140 pipe kit S CAD

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Purewell Variheat mk2 boiler 2x PV180 pipe kit F CAD

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Purewell Variheat mk2 boiler 2x PV180 pipe kit P CAD

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Purewell Variheat mk2 boiler 2x PV180 pipe kit R CAD

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Purewell Variheat mk2 boiler 2x PV180 pipe kit S CAD

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Purewell Variheat mk2 boiler 2x PV70 pipe kit BLR CAD

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Purewell Variheat mk2 boiler 2x PV70 pipe kit F CAD

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Purewell Variheat mk2 boiler 2x PV70 pipe kit P CAD

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Purewell Variheat mk2 boiler 2x PV70 pipe kit R CAD

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Purewell Variheat mk2 boiler 2x PV95 pipe kit F CAD

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Purewell Variheat mk2 boiler 2x PV95 pipe kit P

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Purewell Variheat mk2 boiler 2x PV95 pipe kit R CAD

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Purewell Variheat mk2 boiler 2x PV95 pipe kit S CAD

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Purewell Variheat mk2 boiler 3x PV110 pipe kit F CAD

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Purewell Variheat mk2 boiler 3x PV110 pipe kit P CAD

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Purewell Variheat mk2 boiler 3x PV110 pipe kit R CAD

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Purewell Variheat mk2 boiler 3x PV110 pipe kit S CAD

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Purewell Variheat mk2 boiler 3x PV140 pipe kit F CAD

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Purewell Variheat mk2 boiler 3x PV140 pipe kit P CAD

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Purewell Variheat mk2 boiler 3x PV140 pipe kit R CAD

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Purewell Variheat mk2 boiler 3x PV140 pipe kit S CAD

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Purewell Variheat mk2 boiler 3x PV180 pipe kit F CAD

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Purewell Variheat mk2 boiler 3x PV180 pipe kit P CAD

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Purewell Variheat mk2 boiler 3x PV180 pipe kit R CAD

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Purewell Variheat mk2 boiler 3x PV180 pipe kit S CAD

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Purewell Variheat mk2 boiler 3x PV70 pipe kit F CAD

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Purewell Variheat mk2 boiler 3x PV70 pipe kit P CAD

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Purewell Variheat mk2 boiler 3x PV70 pipe kit R CAD

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Purewell Variheat mk2 boiler 3x PV70 pipe kit S CAD

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Purewell Variheat mk2 boiler 3x PV95 pipe kit F CAD

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Purewell Variheat mk2 boiler 3x PV95 pipe kit P CAD

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Purewell Variheat mk2 boiler 3x PV95 pipe kit R CAD

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Purewell Variheat mk2 boiler 3x PV95 pipe kit S CAD

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Purewell Variheat mk2 boiler PV110 CAD

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Purewell Variheat mk2 boiler PV140 CAD

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Purewell Variheat mk2 boiler PV180 CAD

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Purewell Variheat mk2 boiler PV70 CAD

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Purewell Variheat mk2 boiler PV95 CAD

CAD 1717 kb

218637-2 Purewell Variheat mk2 controls.pdf

196 kb

Purewell Variheat mk2 Brochure for CHANNEL ISLANDS.pdf

5751 kb

Purewell Variheat mk2 AGU 2.550 expansion kit wiring instructions

Installatievoorschriften 2245 kb

Testimonials

We use the Purewell Variheat boilers wherever possible due to their cast iron reliability. Since changing to the mk2s with the upgraded LMS controls platform and spark ignition system, we will continue to be using these for the foreseeable future.

Stuart Giles, Giles Heating

The boilers were very easy to position and install, the installation instructions were clear to follow. Everything was delivered as and when Hamworthy said it would be. We also used the Hamworthy pipe kits, which are great, as they save time on site.

Mark Smith, Leybourne Urwin Ltd

We have a great working relationship with Hamworthy; they provide technical support on the phone and knowledgeable sales managers in the field. The Purewell VariHeat boilers are a fantastic, robust product that we have installed in lots of our projects.

Ainsley Downer, Wessex Building Services

Hamworthy’s Purewells are compact and sturdy cast iron boilers with large waterways, we use them in our temporary boiler rooms for this very reason.

Danny Bulch, Cedar Green Projects Ltd

The Carlton Hotel has seen their system upgraded from the early Hamworthy UR cast iron boilers through to the Purewell VariHeat boilers of today. The upgrades have been straightforward due to the ease of replacement between old atmospheric and newer condensing models in Hamworthy’s range.

Danny Bulch, Director, Cedar Green Ldt

The aluminium heat exchangers in the boilers are optimised to provide even heat distribution, high efficiency, & reliability. The packaged plant room is very quiet for its output due to the high efficiency fan, insulation on the panels & the heat exchanger, eliminating noise-generating surfaces.

Cross Rental Services

Ideal uses/applications

Optional extras

Reverse return header kit available for:

  • 2 boiler installation
  • 3 boiler installation
  • 4 boiler installation ( 2 x 2 boiler installation kit)

 

Often bought with

Chesil pressurisation unit

Learn more

Burstock expansion vessel

Learn more

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Case studies

Allenbourne Middle School in Wimborne

Allenbourn Middle School, Wimborne

Sector: Education

Project: The school suffered from ageing boilers that had already broken down. Spare parts were impossible to source, so the boiler plant was upgraded to cast iron condensing boilers.

Building: School refurbishment

Application: Space heating 285kW

Learn more